EP2409297B1 - Filtrage adaptatif actif pour la réduction du bruit - Google Patents

Filtrage adaptatif actif pour la réduction du bruit Download PDF

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Publication number
EP2409297B1
EP2409297B1 EP10704060.2A EP10704060A EP2409297B1 EP 2409297 B1 EP2409297 B1 EP 2409297B1 EP 10704060 A EP10704060 A EP 10704060A EP 2409297 B1 EP2409297 B1 EP 2409297B1
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EP
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Prior art keywords
noise signal
noise
frequency range
amplitude
broadband
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EP10704060.2A
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German (de)
English (en)
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EP2409297A2 (fr
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Davis W. Pan
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Bose Corp
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Bose Corp
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17825—Error signals
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G10K11/17833—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50—Miscellaneous
    • G10K2210/503—Diagnostics; Stability; Alarms; Failsafe

Definitions

  • This specification describes an active noise reduction system and more particularly an active noise reduction system that reduces divergence of adaptive filters in the presence of high amplitude interfering noise.
  • the present invention relates to an apparatus and a method as claimed in the independent claims 1 and 6, respectively.
  • Dependent claims recite advantageous embodiments.
  • circuitry may be implemented as one of, or a combination of, analog circuitry, digital circuitry, or one or more microprocessors executing software instructions.
  • the software instructions may include digital signal processing (DSP) instructions.
  • DSP digital signal processing
  • signal lines may be implemented as discrete analog or digital signal lines. Multiple signal lines may be implemented as one discrete digital signal line with appropriate signal processing to process separate streams of audio signals, or as elements of a wireless communication system. Some of the processing operations may be expressed in terms of the calculation and application of coefficients.
  • audio signals may be encoded in either digital or analog form; conventional digital-to-analog and analog-to-digital converters may not be shown in circuit diagrams.
  • This specification describes an active noise reduction system. Active noise reduction systems are typically intended to eliminate undesired noise (i.e. the goal is zero noise). However in actual noise reduction systems undesired noise is attenuated, but complete noise reduction is not attained. In this specification "driving toward zero" means that the goal of the active noise reduction system is zero noise, though it is recognized that actual result is significant attenuation, not complete elimination.
  • FIG. 1A there is shown a block diagram of a feed forward active noise reduction system.
  • Communication path 38 is coupled to noise reduction reference signal generator 19 for presenting to the noise reduction reference signal generator a reference frequency F.
  • the noise reduction reference signal generator is coupled to filter 22 and adaptive filter 16.
  • the filter 22 is coupled to coefficient calculator 20.
  • Input transducer 24 is coupled to control block 37 and to coefficient calculator 20, which is in turn bidirectionally coupled to leakage adjuster 18 and adaptive filter 16.
  • Adaptive filter 16 is coupled to output transducer 28 by power amplifier 26.
  • Control block 37 is coupled to leakage adjuster 18.
  • a reference frequency or information from which a reference frequency can be derived, is provided to the noise reduction reference signal generator 19.
  • the noise reduction reference signal generator generates a noise reduction signal, which may be in the form of a periodic signal, such as a sinusoid having a frequency component related to the engine speed, to filter 22 and to adaptive filter 16.
  • Input transducer 24 detects periodic vibrational energy having a frequency component related to the reference frequency and transduces the vibrational energy to a noise signal (sometimes referred to as "error signal”, for convenience hereinafter referred to as a noise signal), which is provided to coefficient calculator 20.
  • Coefficient calculator 20 determines coefficients for adaptive filter 16.
  • Adaptive filter 16 uses the coefficients from coefficient calculator 20 to modify the amplitude and/or phase of the noise cancellation reference signal from noise reduction reference signal generator 19 and provides the modified noise cancellation signal to power amplifier 26.
  • the noise reduction signal is amplified by power amplifier 26 and transduced to vibrational energy by output transducer 28.
  • Control block 37 controls the operation of the active noise reduction elements, for example by activating or deactivating the active noise reduction system or by adjusting the amount of noise attenuation.
  • the adaptive filter 16, the leakage adjuster 18, and the coefficient calculator 20 operate repetitively and recursively to provide a stream of filter coefficients that cause the adaptive filter 16 to modify a signal that, when transduced to periodic vibrational energy, attenuates the vibrational energy detected by input transducer 24.
  • Filter 22 which can be characterized by transfer function H(s), compensates for effects on the energy transduced by input transducer 24 of components of the active noise reduction system (including power amplifier 26 and output transducer 28) and of the environment in which the system operates.
  • Input transducer(s) 24, 24' may be one of many types of devices that transduce vibrational energy to electrically or digitally encoded signals, such as an accelerometer, a microphone, a piezoelectric device, and others. If there is more than one input transducer, 24, 24', the filtered inputs from the transducers may be combined in some manner, such as by averaging, or the input from one may be weighted more heavily than the others. Filter 22, coefficient calculator 20, leakage adjuster 18, and control block 37 may be implemented as instructions executed by a microprocessor, such as a DSP device.
  • Output transducer 28 can be one of many electromechanical or electroacoustical devices that provide periodic vibrational energy, such as a motor or an acoustic driver.
  • FIG. 1B there is shown a block diagram including elements of the feed forward active noise reduction system of FIG. 1A .
  • the feed forward active noise reduction system of FIG. 1B is implemented as an active acoustic noise reduction system in a vehicle cabin, but also may be configured for use in other enclosed spaces, such as a room or control station, or for use in unenclosed spaces, such as a convertible with the top down, a vehicle with the windows open, or a machine operating in an unenclosed space.
  • the system of FIG. 1B also includes elements of an audio entertainment or communications system. For example, if the system of Fig.
  • 1B is implemented in a cabin in a vehicle, such as a passenger car, van, truck, sport utility vehicle, construction or farm vehicle, military vehicle, or airplane, the audio entertainment or communications system may be associated with the vehicle.
  • Entertainment audio signal processor 10 is operationally coupled to signal line 40 to receive an entertainment audio signal and/or an entertainment system control signal C, and is coupled to combiner 14 and may be coupled to leakage adjuster 18.
  • Noise reduction reference signal generator 19 is operationally coupled to signal line 38 and to adaptive filter 16 and cabin filter 22', which corresponds to the filter 22 of FIG. 1A .
  • Adaptive filter 16 is coupled to combiner 14, to coefficient calculator 20, and optionally may be directly coupled to leakage adjuster 18.
  • Coefficient calculator 20 is coupled to cabin filter 22', to leakage adjuster 18, and to microphones 24", which correspond to the input transducers 24, 24' of FIG. 1A .
  • Combiner 14 is coupled to power amplifier 26 which is coupled to acoustic driver 28', which corresponds to output transducer 28 of FIG. 1A ,
  • Control block 37 is operationally coupled to leakage adjuster 18 and to microphones 24".
  • entertainment audio signal processor 10 is coupled to a plurality of combiners 14, each of which is coupled to a power amplifier 26 and an acoustic driver 28'.
  • Each of the plurality of combiners 14, power amplifiers 26, and acoustic drivers 28' may be coupled, through elements such as amplifiers and combiners to one of a plurality of adaptive filters 16, each of which has associated with it a leakage adjuster 18, a coefficient calculator 20, and a cabin filter 22.
  • a single adaptive filter 16, associated leakage adjuster 18, and coefficient calculator 20 may modify noise cancellation signals presented to more than one acoustic driver.
  • Each microphone 24" may be coupled to more than one coefficient calculator 20.
  • All or some of the entertainment audio signal processor 10, the noise reduction reference signal generator 19, the adaptive filter 16, the cabin filter 22', the coefficient calculator 20 the leakage adjuster 18, the control block 37, and the combiner 14 may be implemented as software instructions executed by one or more microprocessors or DSP chips.
  • the power amplifier 26 and the microprocessor or DSP chip may be components of an amplifier 30.
  • FIG. 1B In operation, some of the elements of FIG. 1B operate to provide audio entertainment and audibly presented information (such as navigation instructions, audible warning indicators, cellular phone transmission, operational information [for example, low fuel indication], and the like) to occupants of the vehicle.
  • An entertainment audio signal from signal line 40 is processed by entertainment audio signal processor 10.
  • a processed audio signal is combined with an active noise reduction signal (to be described later) at combiner 14.
  • the combined signal is amplified by power amplifier 26 and transduced to acoustic energy by acoustic driver 28'.
  • a signal related to the reference frequency is provided to cabin filter 22'.
  • the noise reduction reference signal generator 19 generates a noise cancellation signal, which may be in the form of a periodic signal, such as a sinusoid having a frequency component related to a harmonic of the engine speed.
  • the noise cancellation signal is provided to adaptive filter 16 and in parallel to cabin filter 22'.
  • Microphone 24" transduces acoustic energy, which may include acoustic energy corresponding to entertainment audio signals, in the vehicle cabin to a noise audio signal, which is provided to the coefficient calculator 20.
  • the coefficient calculator 20 modifies the coefficients of adaptive filter 16.
  • Adaptive filter 16 uses the coefficients to modify the amplitude and/or phase of the noise cancellation signal from noise reduction reference signal generator 19 and provides the modified noise cancellation signal to signal combiner 14.
  • the combined effect of some electroacoustic elements for example, acoustic driver 28', power amplifier 26, microphone 24" and of the environment within which the noise reduction system operates
  • Cabin filter 22' models and compensates for the transfer function H(s). The operation of the leakage adjuster 18 and control block 37 will be described below.
  • the adaptive filter 16, the leakage adjuster 18, and the coefficient calculator 20 operate repetitively and recursively to provide a stream of filter coefficients that cause the adaptive filter 16 to modify an audio signal that, when radiated by the acoustic driver 28', drives the magnitude of specific spectral components of the signal detected by microphone 24" to some desired value.
  • the specific spectral components typically correspond to fixed multiples of the frequency derived from the engine speed.
  • the specific desired value to which the magnitude of the specific spectral components is to be driven may be zero, but may be some other value as will be described below.
  • FIGS. 1A and 1B may also be replicated and used to generate and modify noise reduction signals for more than one frequency.
  • the noise reduction signal for the other frequencies is generated and modified in the same manner as described above.
  • the content of the audio signals from the entertainment audio signal source includes conventional audio entertainment, such as for example, music, talk radio, news and sports broadcasts, audio associated with multimedia entertainment and the like, and, as stated above, may include forms of audible information such as navigation instructions, audio transmissions from a cellular telephone network, warning signals associated with operation of the vehicle, and operational information about the vehicle.
  • the entertainment audio signal processor may include stereo and/or multi-channel audio processing circuitry.
  • Adaptive filter 16 and coefficient calculator 20 together may be implemented as one of a number of filter types, such as an n-tap delay line; a Leguerre filter; a finite impulse response (FIR) filter; and others.
  • the adaptive filter may use one of a number of types of adaptation schemes, such as a least mean squares (LMS) adaptive scheme; a normalized LMS scheme; a block LMS scheme; or a block discrete Fourier transform scheme; and others.
  • LMS least mean squares
  • the combiner 14 is not necessarily a physical element, but rather may be implemented as a summation of signals.
  • adaptive filter 16 may include more than one filter element.
  • adaptive filter 16 includes two FIR filter elements, one each for a sine function and a cosine function with both sinusoid inputs at the same frequency, each FIR filter using an LMS adaptive scheme with a single tap, and a sample rate which may be related to the audio frequency sampling rate r (for example r 28 ).
  • Suitable adaptive algorithms for use by the coefficient calculator 20 may be found in Adaptive Filter Theory, 4th Edition by Simon Haykin, ISBN 0130901261 .
  • Many active noise reduction systems in vehicles are designed to attenuate engine noise at the reference frequency.
  • events for example driving over a large bump
  • conditions for example an open window
  • the high amplitude interfering noise may be non-correlated or broadband or both, and is typically the result of some event or condition not associated with the operation of the engine.
  • the portion of the noise signal detected by input transducer 24 or 24' resulting from an event or condition resulting in high amplitude interfering noise may be as much or even greater than the portion of the noise signal caused by the engine. This may cause the adaptive system to diverge, resulting in undesirable audible artifacts.
  • Fig. 2 shows a block diagram of the operation of an active noise reduction system to prevent system divergence resulting from high amplitude interfering noise with acoustic energy at the reference frequency.
  • the input transducer 24 (of Fig. 1A or 24' of Fig. 1B ) is coupled to the coefficient calculator 20 by noise signal adjuster 102.
  • the input transducer 24 and the coefficient calculator 20 are spatially reversed in Figs. 1A / 1B and Fig. 2 ; the logical arrangement however is the same in Figs. 1A /B and Fig. 2 ).
  • the noise signal adjuster 102 receives the noise or error signal N from the input transducer 24 and at block 104 determines if high amplitude interfering noise is present in the noise signal. If high amplitude interfering noise is present, at block 106, the noise signal is modified in a manner such that the adaptive system does not diverge, and the noise signal N' is presented to the coefficient calculator. If at step 104, high amplitude interfering noise is not present, the noise signal is presented to the coefficient calculator so that the active noise reduction system functions normally.
  • blocks 102, 104, and 106 are performed by DSP's executing software instructions and the modifying the noise signal at block 106 includes modifying the gain applied to the noise signal, which could include setting the gain to unity (so that the signal is neither amplified nor attenuated) or setting the gain to zero (so that the noise signal is set to zero).
  • One method of determining if there is high amplitude interfering noise present is to measure the wide band amplitude of the noise signal and determine if the wide band amplitude is above a threshold. This method is illustrated in Fig. 3 .
  • Curve 108A represents the highest expected amplitude of engine noise by frequency. The highest expected amplitude curve may be determined empirically. Engine noise is typically narrowband at known harmonics of the reference frequency.
  • Curve 110A represents the noise signal.
  • Curve 112A represents the threshold amplitude. If the amplitude of the noise signal is above the threshold 112A, it is determined that high amplitude interfering noise is present. If the amplitude of the noise signal is below the threshold amplitude, it is determined that high amplitude interfering noise is not present.
  • a threshold amplitude may be difficult. For example in Fig. 4 , if the highest expected amplitude curve of the engine noise (represented by curve 108B) has a peak value that is high relative to the noise signal (represented by curve 110B), it may be difficult to set a threshold that accurately determines if high amplitude interfering noise is present or not. If the threshold is set at level 112B, which is appropriate for a typical engine noise curve represented by curve 107B, it may be determined that high amplitude interfering noise is present even if it is not. If the threshold is set at level 113B, which is appropriate for the highest expected amplitude curve 108B, it may be determined that high amplitude interfering noise is not present, even if it is.
  • Fig. 5 illustrates a method of determining if high amplitude interfering noise is present that can be used in a situation in which the highest amplitude of the engine noise (represented in Fig. 5 by curve 108C) is nearly as great as, or greater than, the amplitude of the interfering noise.
  • the method of Fig. 5 is most effective if the interfering noise (represented by curve 110C) is relatively narrowband or has high amplitude at frequencies between the peak amplitudes of the engine noise, or below the first peak of the engine noise, or both.
  • the noise signal is band pass filtered with a pass band between frequencies f1 and f2, between amplitude peaks of the engine noise, or low pass filtered with a break frequency f3, below the first amplitude peak of the engine noise.
  • the amplitude of the band limited noise is compared to a frequency band threshold 112C that can be lower than broadband threshold 113C, which can be the same as the broadband threshold 113B of Fig. 4 , and even lower than the peak amplitude of the engine noise. If the amplitude is above the frequency band threshold, it is determined that high amplitude interfering noise is present.
  • the low pass filter method is easier to implement than the band pass filter method.
  • band pass because the frequencies at which the peaks occur may vary with conditions, such as engine speed, the frequencies f1 and f2 between the peaks must vary also.
  • FFT's fast Fourier transforms
  • LMS least mean squares
  • the engine noise curve 108D is similar to the engine noise 108C of Fig. 5 .
  • the high amplitude, interfering noise 110D does not have a high level of acoustic energy below frequency f3 but does have a high level of acoustic energy at the frequency of the highest expected amplitude of the engine noise. If the method of Fig. 5 is applied to the situation of Fig. 6 , it may be determined that high amplitude interfering noise is not present, even though it is.
  • Fig. 7 In the situation of Fig. 6 (as indicated by engine noise curve 108D and interfering noise curve 110D), the presence of high amplitude, interfering noise can be accurately determined by the method shown graphically in Fig. 7 and logically in Fig. 8 .
  • the method of Figs. 7 and 8 includes both the frequency band threshold 112D of Fig. 6 and a broadband threshold 113D.
  • the high noise determination block 104 of Fig. 8 includes the determination methods of both Fig. 3 (wideband threshold, block 110) and Fig. 5 (frequency band threshold, block 108). If either threshold is exceeded, it is determined that high amplitude interfering noise is present. If neither threshold is exceeded, it is determined that high amplitude interfering noise is not present.
  • Fig. 3 wideband threshold, block 110
  • Fig. 5 frequency band threshold, block 108
  • decision block 110 can precede decision block 108, or the noise signal can be presented to blocks 108 and 110 in parallel, and the outputs of decision block 108 and 110 be processed by an OR operator.
  • the noise signal may be lowpass (as indicated by low pass filter 109) or bandpass filtered to facilitate comparison with the threshold.
  • the noise signal is filtered with a low pass filter with a break frequency of 20 Hz, a low frequency threshold of 0.1 and a wide band threshold of 0.3 where 1.0 represents a 120 dB SPL signal level.
  • a low pass filter with a break frequency of 20 Hz, a low frequency threshold of 0.1 and a wide band threshold of 0.3 where 1.0 represents a 120 dB SPL signal level.
  • Other embodiments may have different thresholds, with 1.0 representing other signal levels, and the low pass filter may have some other break frequencies.
  • the high noise determination block of Figs. 7 and 8 can be expanded to include more than two tests to determine if high amplitude interfering noise is present and different logical arrangements.
  • the noise signal is modified at block 106.
  • One method of modifying the noise signal so that the adaptive filter does not diverge is to reduce the gain of the microphone for a period of time, for example, 100 msec.
  • Other methods of modifying the noise signal include band limited attenuation. A consequence of reducing the gain of the microphone is that the adaptive system "coasts", that is it continues to output a cancellation signal, but does not attempt to adapt to cancel the interfering noise.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Noise Elimination (AREA)

Claims (8)

  1. Appareil comprenant :
    un système actif de réduction de bruit par anticipation pour la réduction d'un bruit acoustique dans une cabine de véhicule, comprenant
    un transducteur (24) pour la transduction d'un bruit acoustique à un emplacement dans la cabine de véhicule, en un signal de bruit ;
    une circuiterie (104) pour la détermination de l'amplitude du signal de bruit sur une portion limitée d'une plage de fréquences de bande large, après avoir filtré le signal de bruit par le filtrage passe-bande du signal de bruit avec une bande de passage entre des fréquences (fl, f2) entre des crêtes d'amplitude du bruit de moteur de véhicule, ou par le filtrage passe-bas du signal de bruit avec une fréquence de rupture (f3) au-dessous de la première crête d'amplitude du bruit de moteur ;
    une circuiterie (108) pour la comparaison de l'amplitude du signal de bruit dans la portion limitée de la plage de fréquences de bande large à un seuil de plage de fréquences limitée ; et
    une circuiterie (106) pour la modification du signal de bruit si l'amplitude du signal de bruit dans la portion limitée de la plage de fréquences de bande large dépasse le seuil de plage de fréquences limitée, par la réduction d'un gain appliqué au signal de bruit pendant une période de temps ou par l'application d'une atténuation limitée de bande.
  2. Appareil selon la revendication 1, comprenant en outre :
    une circuiterie (104) pour la détermination de l'amplitude du signal de bruit sur une plage de fréquences de bande large ;
    une circuiterie (110) pour la comparaison de l'amplitude du signal de bruit dans la plage de fréquences de bande large à un seuil de bande large ; et
    une circuiterie (106) pour la modification du signal de bruit si l'amplitude du signal de bruit dans la portion limitée de la plage de fréquences dépasse le seuil de plage de fréquences limitée ou l'amplitude du signal de bruit dans la plage de fréquences de bande large dépasse le seuil de bande large, par la réduction d'un gain appliqué au signal de bruit pendant une période de temps ou par l'application d'une atténuation limitée de bande.
  3. Appareil selon l'une quelconque des revendications précédentes, comprenant en outre :
    un filtre passe-bas pour le filtrage du signal de bruit pour fournir un signal de bruit filtré par filtrage passe-bas ; et
    une circuiterie pour fournir le signal de bruit filtré par filtrage passe-bas à la circuiterie pour la comparaison du signal de bruit dans la portion limitée de la plage de fréquences de bande large.
  4. Appareil selon l'une quelconque des revendications précédentes, comprenant en outre :
    un filtre passe-bande pour le filtrage du signal de bruit pour fournir un signal de bruit filtré par filtrage passe-bande ; et
    une circuiterie pour fournir le signal de bruit filtré par filtrage passe-bande à la circuiterie pour la comparaison du signal de bruit dans la portion limitée de la plage de fréquences de bande large.
  5. Appareil selon la revendication 2, dans lequel le seuil de bande large est différent du seuil de plage de fréquences limitée.
  6. Procédé de fonctionnement d'un système actif de réduction de bruit par anticipation pour la réduction d'un bruit acoustique dans une cabine de véhicule, comprenant :
    la transduction d'un bruit acoustique dans la cabine de véhicule en un signal de bruit ;
    la détermination de l'amplitude du signal de bruit sur une portion limitée d'une plage de fréquences de bande large, après avoir filtré le signal de bruit par le filtrage passe-bande du signal de bruit avec une bande de passage entre des fréquences (fl, f2) entre des crêtes d'amplitude du bruit de moteur de véhicule, ou par le filtrage passe-bas du signal de bruit avec une fréquence de rupture (f3) au-dessous de la première crête d'amplitude du bruit de moteur ;
    la comparaison de l'amplitude du signal de bruit dans la portion limitée de la plage de fréquences de bande large à un seuil de plage de fréquences limitée ; et
    si l'amplitude du signal de bruit dans la portion limitée de la plage de fréquences de bande large dépasse le seuil de plage de fréquences limitée, la modification du signal de bruit par la réduction d'un gain appliqué au signal de bruit pendant une période de temps ou par l'application d'une atténuation limitée de bande.
  7. Procédé selon la revendication 6, comprenant en outre :
    la détermination de l'amplitude du signal de bruit sur une plage de fréquences de bande large ;
    la comparaison de l'amplitude du signal de bruit dans la plage de fréquences de bande large à un seuil de bande large ; et
    si l'amplitude du signal de bruit dans la portion limitée de la plage de fréquences dépasse le seuil de plage de fréquences limitée ou l'amplitude du signal de bruit dans la plage de fréquences de bande large dépasse le seuil de bande large, la modification du signal de bruit par la réduction d'un gain appliqué au signal de bruit pendant une période de temps ou par l'application d'une atténuation limitée de bande.
  8. Procédé selon la revendication 7, dans lequel le seuil de bande large est différent du seuil de plage de fréquences limitée.
EP10704060.2A 2009-03-20 2010-02-09 Filtrage adaptatif actif pour la réduction du bruit Active EP2409297B1 (fr)

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US12/408,441 US8335318B2 (en) 2009-03-20 2009-03-20 Active noise reduction adaptive filtering
PCT/US2010/023529 WO2010107528A2 (fr) 2009-03-20 2010-02-09 Filtrage adaptatif actif pour la réduction du bruit

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WO (1) WO2010107528A2 (fr)

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US8335318B2 (en) 2012-12-18
JP2012521020A (ja) 2012-09-10
US20100239105A1 (en) 2010-09-23
WO2010107528A2 (fr) 2010-09-23
WO2010107528A3 (fr) 2011-04-07
JP5342063B2 (ja) 2013-11-13
HK1167203A1 (en) 2012-11-23
CN102356426B (zh) 2014-12-03
CN102356426A (zh) 2012-02-15

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